MicroLife

Curvularia is a common fungus you might not notice!

It’s a dematiaceous (darkly pigmented) mold, usually brown to black.

Often found in soil, plants, and grasses, especially in warm climates.

Can cause plant diseases, like leaf spots and root rot.

Occasionally causes eye infections, sinus infections, or skin infections in humans, usually when there’s a cut or compromised immunity.

Produces curved spores, which is how it got its name!

Serratia marcescens is a fascinating Gram-negative rod! Here’s why:

Often produces a red pigment called prodigiosin

Can live in moist environments like sinks, showers, and even medical equipment

Sometimes causes urinary tract infections, wound infections, and respiratory infections

Known for forming biofilms, making it tricky to clean

Loves warm, damp places — that’s why you see red streaks in bathrooms!

✅DNA vs RNA: Key Differences Explained for Class 12 Biology

Gram Negative Rods

• Gram-negative rods stain pink/red due to a thin peptidoglycan layer
• They have an outer membrane with LPS (endotoxin) — a big player in inflammation & sepsis
• Common Gram-negative rods include E. coli, Klebsiella, Pseudomonas, Salmonella
• Many are part of normal gut flora, but can cause serious infections if they travel
• Often associated with UTIs, bloodstream infections, pneumonia, and GI illness
• Some GNRs are highly antibiotic-resistant, making identification critical
• Shape matters: rod = bacillus, not cocci
• Seeing GNRs in a positive blood culture is clinically significant